Nuclear Theory·nucl-th

Tuesday·September 26, 2017

15 papers—5 primary·10 cross-listed

01
[Submitted on 22 Sept 2017]
Isospin Effect in Three-Body Kaonic Clusters
I. Filikhin · B. Vlahovic
The kaonic clusters $K^{-} K^{-} p$ and $pp K^{-}$ are described based on the configuration space Faddeev equations for $AA B$ system. The $A B$ interaction is given by isospin-dependent potentials. For this isospin model, we show that the relation $∣ E_{3} (V_{AA} = 0) ∣ < 2 ∣ E_{2} ∣$ is satisfied when $E_{2}$ is the binding energy of the $A B$ subsystem and $E_{3} (V_{AA} = 0)$ is the three-body binding energy when interaction between identical particles is omitted, $V_{AA} = 0$ . For the $N N K ˉ$ system, taking into account weak attraction of $N N$ interaction the relation leads to the evaluation $∣ E_{3} ∣ \leq 2∣ E_{2} ∣$ . The "isospinless model" for the kaonic clusters based on the isospin averaged $N K ˉ$ potential demonstrates the opposite relation $∣ E_{3} (V_{AA} = 0) ∣ > 2 ∣ E_{2} ∣$ . The isospin "given charge formalism" is presented for $N N K ˉ$ cluster. This formalism is related to isospin model by unitary transformation of the isospin basis. An interpretation of the "particle representation" for $N N K ˉ$ system is proposed.
Comments:
19 pages, 3 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1709.07967 [pdf]
AIP Conf.Proc.(2019)·1 citation
02
[Submitted on 23 Sept 2017]
Quest for consistent modelling of statistical decay of the compound nucleus
Tathagata Banerjee · S. Nath · Santanu Pal
A statistical model description of heavy ion induced fusion-fission reactions is presented where shell effects, collective enhancement of level density, tilting away effect of compound nuclear spin and dissipation are included. It is shown that the inclusion of all these effects provides a consistent picture of fission where fission hindrance is required to explain the experimental values of both pre-scission neutron multiplicities and evaporation residue cross-sections in contrast to some of the earlier works where a fission hindrance is required for pre-scission neutrons but a fission enhancement for evaporation residue cross-sections.
Comments:
14 pages, 2 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1709.08029 [pdf]
PLB(2018)·20 citations
03
[Submitted on 25 Sept 2017]
Effective description of hot QCD medium in strong magnetic field and longitudinal conductivity
Manu Kurian🇮🇳 · Vinod Chandra🇮🇳
Hot QCD medium effects have been studied in the effective quasi-particle description of quark-gluon plasma. This model encodes the collective excitation of gluons and quarks/anti-quarks in the thermal medium in terms of effective quarks and gluons having non-trivial energy dispersion relation. The present investigation involves the extension of the effective quasi-particle model in strong magnetic field limit. Realizing, hot QCD medium in the strong magnetic field as an effective grand canonical system in terms of the modified quark, anti-quark and gluonic degrees of freedom, the thermodynamics has been studied. Further, the Debye mass in hot QCD medium has to be sensitive to the magnetic field, and subsequently the same has been observed for the effective hot QCD coupling. As an implication, electrical conductivity (longitudinal) has been studied within an effective kinetic theory description of hot QCD in the presence of the strong magnetic field. The hot QCD equation of state (EoS), dependence entering through the effective coupling and quasi-parton distribution function, found to have a significant impact on the longitudinal electrical conductivity in strong magnetic field background.
Comments:
12 pages, 8 figures, two column
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1709.08320 [pdf]
PRD(2017)·73 citations
04
[Submitted on 21 Sept 2017]
What makes the peak structure of the $Λ p$ invariant-mass spectrum in the $K^{-}^{3} He \to Λ p n$ reaction?
Takayasu Sekihara (JAEA, Ibaraki)🇯🇵 · Eulogio Oset (Valencia U. & Valencia U., IFIC)🇪🇸 · Angels Ramos (Barcelona U., ECM & ICC, Barcelona U.)🇪🇸
Recently a peak structure was observed near the $K^{-} pp$ threshold in the in-flight $^{3} He (K^{-}, Λ p) n$ reaction of the E15 experiment at J-PARC, which could be a signal of a $K ˉ N N$ bound state. In order to investigate what is the origin of this peak, we calculate the cross section of this reaction, in particular based on the scenario that the $K ˉ N N$ bound state is indeed generated and decays into $Λ p$ . We find that the numerical result of the $Λ p$ invariant-mass spectrum in the $K ˉ N N$ bound scenario is consistent with the J-PARC E15 data.
Comments:
6 pages, 6 EPS figures, talk given at the 2nd Jagiellonian Symposium on Fundamental and Applied Subatomic Physics, Krakow, Poland, 4-9 June, 2017
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
1709.08487 [pdf]
Acta Phys.Polon.B(2017)·2 citations
05
[Submitted on 25 Sept 2017]
Thouless-Valatin Rotational Moment of Inertia from the Linear Response Theory
K. Petrík · M. Kortelainen
Spontaneous breaking of continuous symmetries of a nuclear many-body system results in appearance of zero-energy restoration modes. Such modes introduce a non-physical contributions to the physical excitations called spurious Nambu-Goldstone modes. Since they represent a special case of collective motion, they are sources of important information about the Thouless-Valatin inertia. The main purpose of this work is to study the Thouless-Valatin rotational moment of inertia as extracted from the Nambu-Goldstone restoration mode that results from the zero-frequency response to the total angular momentum operator. We examine the role and effects of the pairing correlations on the rotational characteristics of heavy deformed nuclei in order to extend our understanding of superfluidity in general. We use the finite amplitude method of the quasiparticle random phase approximation on top of the Skyrme energy density functional framework with the Hartree-Fock-Bogoliubov theory. We have successfully extended this formalism and established a practical method for extracting the Thouless-Valatin rotational moment of inertia from the strength function calculated in the symmetry restoration regime. Our results reveal the relation between the pairing correlations and the moment of inertia of axially deformed nuclei of rare-earth and actinide regions of the nuclear chart. We have also demonstrated the feasibility of the method for obtaining the moment of inertia for collective Hamiltonian models. We conclude that from the numerical and theoretical perspective, the finite amplitude method can be widely used to effectively study rotational properties of deformed nuclei within modern density functional approaches.
Comments:
10 pages, 5 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1709.08534 [pdf]
PRC(2018)·14 citations

Affiliations

first authorsco-authorsvia INSPIRE

Isospin Effect in Three-Body Kaonic Clusters

Quest for consistent modelling of statistical decay of the compound nucleus

Effective description of hot QCD medium in strong magnetic field and longitudinal conductivity

What makes the peak structure of the Λp invariant-mass spectrum in the K−3He→Λpn reaction?

Thouless-Valatin Rotational Moment of Inertia from the Linear Response Theory

Affiliations

What makes the peak structure of the $Λ p$ invariant-mass spectrum in the $K^{-}^{3} He \to Λ p n$ reaction?